64448569920 has 448 divisors, whose sum is σ = 243168952320. Its totient is φ = 14149804032.

The previous prime is 64448569919. The next prime is 64448569931. The reversal of 64448569920 is 2996584446.

It is a tau number, because it is divible by the number of its divisors (448).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 43457499 + ... + 43458981.

It is an arithmetic number, because the mean of its divisors is an integer number (542787840).

Almost surely, 2^64448569920 is an apocalyptic number.

64448569920 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 64448569920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (121584476160).

64448569920 is an abundant number, since it is smaller than the sum of its proper divisors (178720382400).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

64448569920 is a wasteful number, since it uses less digits than its factorization.

64448569920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1762 (or 1752 counting only the distinct ones).

The product of its (nonzero) digits is 14929920, while the sum is 57.

The spelling of 64448569920 in words is "sixty-four billion, four hundred forty-eight million, five hundred sixty-nine thousand, nine hundred twenty".